Instrument Information
IDENTIFIER urn:nasa:pds:context:instrument:go.hic::1.3
NAME Heavy Ion Counter for GO
TYPE Charged Particle Detector
DESCRIPTION The Heavy Ion Counter (HIC) aboard the Galileo spacecraft is designed to monitor energetic heavy nuclei from carbon to nickel within the energy range of approximately 6 to 200 MeV nucl^-1. This innovative instrument enhances our understanding of the inner Jovian magnetosphere by measuring fluxes of trapped heavy ions, including those with the potential to impact spacecraft electronics. The HIC represents a modified iteration of the Voyager Cosmic-Ray Science instrument, significantly improving prior measurements through its larger geometric factors and broad energy spectrum. Following a review of historical findings from the Voyager missions, the paper delineates expected insights from the HIC, particularly in characterizing the dynamic environment of energetic heavy ions originating from Io and the response of these particles to solar influences. Anticipated outcomes include the refinement of flux measurements and the elucidation of physical processes governing heavy ion loss mechanisms, with implications for understanding ultraviolet and X-ray auroral emissions on Jupiter. The detailed architecture of the HIC, comprised of dual solid-state detector telescopes for versatile energy coverage and background discrimination, is presented alongside operational methodologies for data acquisition and analysis, establishing a robust platform for future investigations into Jovian magnetospheric phenomena.
MODEL IDENTIFIER
NAIF INSTRUMENT IDENTIFIER
SERIAL NUMBER not applicable
REFERENCES Barbosa, D.D., A. Eviatar, and G.L. Siscoe, On the Acceleration of Energetic Ions in Jupiter's Magnetosphere, J. Geophys. Res., Vol. 89, p. 3789, 1984.

MOS-GLL-3-310, Flight Software Requirements

Garrard, T.L., N. Gehrels, E.C. Stone, The Galileo Heavy Element Monitor, Space Sci. Rev., 60, 305, 1992.

Gehrels, N., and E.C. Stone, Energetic oxygen and sulfur ions in the Jovian magnetosphere and their contribution to the auroral excitation, J. Geophys. Res., 88, 5537, 1983.

Gehrels, N., Energetic Oxygen and Sulfur Ions in the Jovian Magnetosphere, Ph.D. Thesis, California Inst. of Tech., Pasadena, 1982.

Gehrels, N., E.C. Stone, and J.H. Trainor, Energetic oxygen and sulfur in the Jovian magnetosphere, J. Geophys. Res., 86, 8906, 1981.

Krimigis, S.M., T.P. Armstrong, W.I. Axford, C.O. Bostrom, C.Y. Fan, G. Gloeckler, L.J. Lanzerotti, E.P. Keath, R.D. Zwickl, J.F. Carbary, and D.C. Hamilton, Low-Energy Charged Particle Environment at Jupiter - A First Look, Science, 204, 998, 1979.

Krimigis, S.M., T.P. Armstrong, W.I. Axford, C.O. Bostrom, C.Y. Fan, G. Gloeckler, L.J. Lanzerotti, E.P. Keath, R.D. Zwickl, J.F. Carbary, and D.C. Hamilton, Hot Plasma Environment at Jupiter: Voyager 2 Results, Science, 206, 977, 1979.

SIS 2244-05 P2, Instrument Packet File

Siscoe, G.L., A. Eviatar, R.M. Thorne, J.D. Richardson, F. Bagenal, and J.D. Sullivan, Ring Current Impoundment of the Io Plasma Torus, J. Geophys. Res., 86, 8480, 1981.

Stilwell, D.E., W.D. Davis, R.M. Joyce, F.B. McDonald, J.H. Trainor, W.E. Althouse, A.C. Cummings, T.L. Garrard, E.C. Stone, and R.E. Vogt, The Voyager Cosmic Ray Experiment, IEEE Trans. on Nuclear Science, Vol. 26, p. 513, 1979.

Stone, E.C., R.E. Vogt, F.B. McDonald, B.J. Teegarden, J.H. Trainor, J.R. Jokipii, and W.R. Webber, Cosmic ray investigation for the Voyager missions; energetic particle studies in the outer heliosphere--and beyond, Space Sci. Rev., 12, No. 3, 355-376, Dec. 1977.

Thorne, R.M., Injection and loss mechanisms for energetic ions in the inner Jovian magnetosphere, J. Geophys. Res., 87, 8105, 1982.

Vogt, R.E., W.R. Cook, A.C. Cummings, T.L. Garrard, N. Gehrels, E.C. Stone, J.H. Trainor, A.W. Schardt, T. Conlon, N. Lal, and F.B. McDonald, Voyager 1: Energetic Ions and Electrons in the Jovian Magnetosphere, Science, 204, 1003, 1979.

Vogt, R.E., A.C. Cummings, T.L. Garrard, N. Gehrels, E.C. Stone, J.H. Trainor, A.W. Schardt, T.F. Conlon, and F.B. McDonald, Voyager 2: Energetic Ions and Electrons in the Jovian Magnetosphere, Science, 206, 984, 1979.